Orchard hay is a type of grass hay grown from orchard grass. This type of hay is excellent horse feed, but can be fed to most any grazing animal.

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Herbivores eat orchard grass. Many types of animals are herbivore. The geographical location of the plain will determine the native specials of animals there. Some examples of herbivores are cattle, dear, and mice.

Orchard hay is usually just a grass hay, so it may be your local hay. There are similar types of grass hay, (timothy, rye) and sometimes you can find them mixed with other types of hay. This kind of hay is good but for most horses they may need alfalfa or oat hay in addition to orchard. 'Easy keepers' do well with orchard hay because they maintain their body weight more easily.

From what I've learned, nothing but physically removing it or using Round Up. It's a perennial grass, which some people actually like to grow. Not me.